Phlearn has a great collection of free and premium content available. The premium paid content are referred to as Pro Tutorials and they are some of the best advanced digital photography and Photoshop tutorials available. Each lesson is relatively short and concise enough to watch in one sitting. While the PRO tutorials are more in-depth, they are still easy to follow as long as you have a basic grasp of the concepts being discussed.
This link is to the free section of the website.